Rate-Of-Change Limit And Control Limit Time - Toshiba LF620F Instruction Manual

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8.2.11 Rate-Of-Change Limit and Control Limit Time

The rate-of-change limit is used to control sudden changes of the converter's flow rate signal output
when excessive noise is contained in the flow rate signal.
The rate-of-change limit (set in percent value to the span of measuring range) and control limit time (set
in second) are used, and if the flow rate signal sampling value exceeds the rate-of-change limit value
based on the previous average value of the flow rate signal, the converter rejects the sampling value and
outputs the average value including the maximum value of the rate-of-change value.
In addition, if the limit-exceeding flow rate sampling value continues for the same flow direction for
more than the preset control limit time, the data will be considered as flow rate variation and that
sampling value will be used as normal output data.
You can set these two parameters within the ranges shown below:
• Rate-of-change limit
• Control limit time:
Note：If "0" is set in either of these parameters, the rate-of-change limit function is disabled.
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0 to 30% / 50ms (in increments of 0.1%)
0 to 20s (in increments of 1s)
－ 74 －
6 F 8 A 0 9 2 8
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